When objection is made to the admissibility of evidence, such evidence may be received subject to a later ruling. The officer conducting the hearing may, in his discretion, either with or without objection, exclude inadmissible evidence or order cumulative evidence discontinued. Parties objecting to the introduction of evidence shall state the precise grounds of such objection at the time such evidence is offered. A party may move to exclude evidence previously admitted pursuant to WAC 10-08-140(6); a party may also move to exclude previously admitted evidence if a subsequent ruling by the presiding officer renders previously admitted evidence irrelevant, cumulative, immaterial and/or inadmissible and the moving party can demonstrate that the granting of such motion will not unjustly prejudice the rights of the other party. Such a motion shall be permissible and considered timely if made prior to the close of the hearing.